[GHC] #13848: Unexpected order of variable quantification with GADT constructor

[GHC]

#13848: Unexpected order of variable quantification with GADT constructor
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |             Keywords:
      Resolution:                    |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Well it would take a bit more plumbing, I agree. You'd need to take the
 `qtkvs` returned by `tcGadtSigType` in `TcTyClsDecls.tcConDecl` and pass
 it on to `buildDataCon`, which can in turn give them to `mkDataConRep` to
 use instead of calling `dataConUserType`.

 I'm not certain that's all, but I think so.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13848#comment:5>
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